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This would be an entertaining comment when read by a C programmer:

    // Overly clever way of saying: increment `currentChunk` then use the incremented value
    this.chunks[++currentChunk] = []

Pre- and post-increment operators are bread and butter in C, hardly overly clever. Are they a recent addition to JS?

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Nope.. They've been in JS since the early versions of emcascript. JS is often used for more web-appy stuff than actual math so I wouldn't say they're used very abundantly, which may explain the comment.

On top of that, he could have just written "currentChunk++;" and skipped the comment entirely.

wouldn't that return the value of currentChunk before it was incremented? So it would need an additional line to be equivalent to the example (making it a bit more readable in my opinion):

  currentChunk++;
  this.chunks[currentChunk] = [];

Which is perhaps what you meant all along. Please excuse the pedantry.

Yeah, that's what I meant - instead of taking the shortcut with a comment explaining it, just don't take it in the first place.

Not only when read by a C programmer. I'm a JS programmer and I don't understand what's "overly clever" about something you learn in JS 101.

Although the post-increment (x++) operator was part of 'JS 101' for me, I've never knowingly seen the pre-increment (++x) operator before. TIL.

The comment was a bit tongue-in-cheek, but I'll accept that I oversold it.

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